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There is a 3mm Orion Planetary in the classifieds for a reasonable price may be worth a try. If you do want to go lower than 3mm may I suggest you put a wanted ad for a 2.5mm Tele Vue Nagler. This will give you a much wider apparent field for longer viewing when not tracking.
Your 5mm DeLite with 2x Tele Vue Barlow is a fine combination to give you an idea of what 2.5mm will show you in terms of magnification. When not using the 4-2 Nagler zoom I use both 3.5 and 2.5 Naglers on the TV-101. A 3mm Radian fills the gap in between and this is where the Nagler zoom is so useful for it is an infinite number of focal lengths between two limits with click stops every 0.5mm, (1mm click stops for the 6-3mm Nagler zoom).
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